Finding the Third Proportional to 123,130.69 and 261,088.31

Step by Step Solution

1. Step 1: Write the proportion equation
   123,130.69 : 261,088.31 = 261,088.31 : x
2. Step 2: Convert to fraction form
   123,130.69/261,088.31 = 261,088.31/x
3. Step 3: Cross multiply
   123,130.69x = 261,088.31 × 261,088.31
4. Step 4: Simplify right side
   123,130.69x = 68,167,106,924.10
5. Step 5: Solve for x
   x = 68,167,106,924.10/123,130.69
6. Step 6: Final answer
   x = 553,615.90